brown hydroids, need help!

I am considering using a rubber maid trough to quarantine all live rock for 8 weeks, and replace snad bed at same time.

I can make >50% severely recede when I turn lights off for three days. I would like to understand life cycle to know if they will become eliminated or dormant with this technique.
 
I've check for availability and would say no at this time on the east coast. Not much interest in special order either from anyone and probably will never ask again.
 
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